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Preangulated TMA T-loop springÀÇ Àû¿ë À§Ä¡ º¯È­¿¡ µû¸¥ °ßÄ¡ÀÇ Ãʱâ ÀÀ·Â ºÐÆ÷¿¡ ´ëÇÑ À¯ÇÑ¿ä¼Ò¹ýÀû ¿¬±¸

AFEM study about the initial stress distribution on canine altered by the application point of preangulated TTA T-loop spring

Korean Journal of Orthodontics 1999³â 29±Ç 5È£ p.521 ~ 534
±èÁ¤¹Î, ÀÌÁø¿ì, Â÷°æ¼®,
¼Ò¼Ó »ó¼¼Á¤º¸
±èÁ¤¹Î (  ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
ÀÌÁø¿ì ( Lee Jin-Woo ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
Â÷°æ¼® ( Cha Kyung-Suk ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç

Abstract

º» ¿¬±¸´Â »ó¾Ç °ßÄ¡, »ó¾Ç Á¦ 2¼Ò±¸Ä¡, »ó¾Ç Á¦ 1 ´ë±¸Ä¡ÀÇ À¯ÇÑ¿ä¼Ò ¸ðµ¨À» Á¦ÀÛÇÏ¿´°í,
0.018¡¿0.025 ÀÎÄ¡ Stainless steel wire¸¦ °íÁ¤¿ø °­È­¸¦ À§ÇØ »ó¾Ç Á¦ 2¼Ò±¸Ä¡¿Í Á¦ 1´ë±¸
Ä¡¿¡ À§Ä¡½ÃÄ×´Ù. 0.017¡¿0.025 ÀÎÄ¡ T-loop springÀÇ ÀüÈĹæÀû À§Ä¡¿¡ µû¸¥ ÀÀ·Â ºÐÆ÷¸¦ ¾Ë
¾Æº¸±â À§ÇØ T-loop springÀÇ Áß°£ÀÌ °ßÄ¡¿Í Á¦ 1´ë±¸Ä¡ °Å¸®ÀÇ Áß°£¿¡ À§Ä¡ÇÏ´Â °Í°ú,
2mm Àü¹æ¿¡ À§Ä¡ÇÏ´Â °Í, 2mm ÈĹ濡 À§Ä¡ÇÏ´Â °ÍÀÇ 3°¡Áö À¯ÇÑ ¿ä¼Ò¸ðµ¨À» Á¦ÀÛÇÏ¿´´Ù.
ÀÌ T-loop springÀ» 6mm °­Á¦º¯À§½ÃÄÑ ¹ß»ýÇÏ´Â ÈûÀ» °¢ Ä¡¾Æ¿¡ Àû¿ë½ÃÄ×À¸¸ç, °ßÄ¡¿¡¼­
¹ß»ýÇÏ´Â Èû°ú ÀÀ·Â¿¡ ´ëÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. 3°¡Áö ÇüÅ ¸ðµÎ¿¡¼­ À¯»çÇÑ Å©±âÀÇ ÈĹæ°ßÀηÂÀ» º¸¿´´Ù.
2. 3°¡Áö ÇüÅ ¸ðµÎ¿¡¼­ À¯»çÇÑ Å©±â¿Í ºñ½ÁÇÑ ÀÀ·Â ºÐÆ÷¸¦ º¸¾Ò´Ù.
3. 3°¡Áö ÇüÅ ¸ðµÎ¿¡¼­ ȸÀü Áß½ÉÀº Ä¡±Ù´Ü 2/3 ºÎºÐ¿¡¼­ º¸¿´´Ù.
4. 2mm Àü¹æ¿¡ À§Ä¡µÈ T-loop spring°ú 2mm ÈĹ濡 À§Ä¡µÈ T-loop spring¿¡ °¢°¢ ÇÔÀÔ·Â
°ú Á¤Ãâ·ÂÀ» º¸ÀÌÁö¸¸ ±× Å©±â°¡ À۾Ƽ­ ÀÀ·Â ¾ç»ó¿¡ ¿µÇâÀ» ÁÖÁö ¸øÇÑ´Ù.
#ÃÊ·Ï#
The purpose of this study was to find the difference of stress distribution on canine
altered by the application point of preangulated T-loop spring T-loop spring. For this
study, the finite element models of upper left canine, upper left second premolar and
upper left first molar were made. Also, the finite element models of 0.017¡¿0.025 inch
preangulated, preactivated T-loop spring and 0.018¡¿0.025 inch stainless steel wire were
made. Three types of T-loop spring were made : the middle of activated T-loop is
positioned in accordance with the middle position of distance of bracket position of both
the canine and first molar, 2mm anterior, 2mm posterior.
We compared the forces and the distribution of stress that were generated by the
difference of position of T-loop spring. The results were as follows.
1. All of the 3 types of T-loop spring showed the similar retraction forces.
2. All showed the similar amount & pattern of stress distribution.
3. The centers of rotation of canine in 3 types of T-loop spring were same and were
positioned between C and D plane.
4. The canine showed the intrusive force by 2mm anterior positioned T-loop spring, but
the extrusive force by 2mm posterior positioned T-loop spring. Neverthless, because of
the small amount of the forces, the effect of vertical force was not significant.

Å°¿öµå

À¯ÇÑ¿ä¼Ò¹ý; TMA T-loop spring; FEM study; TMA T-loop spring;

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